Landscape-education classWhat: The Castaic Lake Water Agency hosts a free workshop about water management and how to improve water efficiency.When: 9 a.m. to noonWhere: Castaic Lake Water Agency, 27234 Bouquet Canyon Road, Valencia 91355Contact:www.clwa.org

Donate food, get spine in shapeWhat: Bring in two bags of groceries and receive a free adjustment (existing patients) or a complete initial exam and X-rays for only $20 (new patients) at De Sesa Chiropractic Inc. Groceries will be donated to the Santa Clarita Valley Food Pantry. Each bag of groceries also earns the donor a raffle ticket. RSVP requested.When: 9 a.m. to noonWhere: 27674 Newhall Ranch Road, Suite 65, Valencia 91355Contact: (661) 294-0429

Helping Hands ThanksgivingWhat: New Life Assembly of God hosts a Thanksgiving dinner for the less fortunate and homeless in the community.When: 1 p.m.Where: 27053 Honby Ave., Canyon Country 91351Contact: (661) 251-2770

Walk for Special NeedsWhat: Together We Stand, a dance group for kids and teens with and without special needs, hosts a 2-mile charity walk. Bring water and dress comfortably.When: 2 p.m. to 4 p.m.Where: Central Park, 27510 Bouquet Canyon Road, Saugus 91350Contact: (661) 222-7910

Cigar walkWhat: Walk as a group to different locations, stopping at each one to enjoy a cigar. Free, ages 21+ only.When: 5-11:30 p.m.Where: Peet’s Coffee, 27047 McBean Parkway, Valencia 91355Contact:www.ValenciaCigarLounge.com

2day in historyToday is Saturday, Nov. 20, the 324th day of 2010. There are 41 days left in the year.

Today’s Highlight in History: On Nov. 20, 1910, the Mexican Revolution of 1910, which overthrew longtime President Porfirio Diaz, had its beginnings under the Plan of San Luis Potosi that had been issued by Francisco I. Madero.

Ten years ago: Lawyers for Al Gore and George W. Bush battled before the Florida Supreme Court over whether the presidential election recount should be allowed to continue.

Five years ago: Israel’s dovish Labor Party voted to pull out of Prime Minister Ariel Sharon’s government in the opening salvo of an election campaign.

One year ago: Scientists in Geneva restarted the Large Hadron Collider, the world’s largest atom smasher, after a year of repairs.